CVE-2022-49248

Local service interruption via uninitialized AV/C flag

Published Feb 26, 2025 · Updated May 11, 2026

Use of an uninitialized resource in the Linux kernel allows local users to interrupt service through FireWire AV/C transactions. In fcp_avc_transaction(), non-control and non-notify commands leave the deferrable Boolean unset, and fcp_response() later reads it while handling an INTERIM response. The path requires local low-privileged access and FireWire AV/C activity; ordinary non-control and non-notify transactions suffer no disadvantage because they do not use INTERIM status.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized resource in the Linux kernel allows local users to interrupt service through FireWire AV/C transactions. In fcp_avc_transaction(), non-control and non-notify commands leave the deferrable Boolean unset, and fcp_response() later reads it while handling an INTERIM response. The path requires local low-privileged access and FireWire AV/C activity; ordinary non-control and non-notify transactions suffer no disadvantage because they do not use INTERIM status.

The record

CVE
CVE-2022-49248
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <39d2c4a33dc1b4402cec68a3c8f82c6588b6edce
  2. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <60e5d391805d70458a01998de00d0c28cba40bf3
  3. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <7025f40690a235a118c87674cfb93072694aa66d
  4. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <7e6f5786621df060f8296f074efd275eaf20361a
  5. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <99582e4b19f367fa95bdd150b3034d7ce8113342
  6. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <b2b65c9013dc28836d82e25d0f0c94d794a14aba
  7. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <bf0cd60b7e33cf221fbe1114e4acb2c828b0af0d
  8. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <d07e4bbaff6fbba6f70c04b092ea7d9afcdf392e
  9. Affected versionversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <eab74c41612083bd627b60da650e19234e4f1051
  10. Affected versionversion=3.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <39d2c4a33dc1b4402cec68a3c8f82c6588b6edce; version=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <60e5d391805d70458a01998de00d0c28cba40bf3; version=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <7025f40690a235a118c87674cfb93072694aa66d; version=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <7e6f5786621df060f8296f074efd275eaf20361a; version=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <99582e4b19f367fa95bdd150b3034d7ce8113342; version=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <b2b65c9013dc28836d82e25d0f0c94d794a14aba; version=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <bf0cd60b7e33cf221fbe1114e4acb2c828b0af0d; version=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <d07e4bbaff6fbba6f70c04b092ea7d9afcdf392e; version=00a7bb81c20f3e81711e28e0f6c08cee8fd18514 <eab74c41612083bd627b60da650e19234e4f1051; version=3.16

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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